Thermon Group Holdings, Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Expense (Details)

Stock-Based Compensation Expense (Details) - USD ($)		12 Months Ended
Stock-Based Compensation Expense (Details) - USD ($)	May 05, 2011	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	Jul. 28, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Benefit (loss) from excess tax deduction from option exercises		$ (448,000)	$ 92,000	$ 1,592,000
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net		(1,069,000)	92,000	$ 1,592,000
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition		3,402,000	3,749,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercised (in shares)				(46,623)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Exercised, weighted average exercise price (in dollars per share)				$ 20.67
Stock compensation expense		$ 3,402,000	3,749,000	$ 3,295,000
Total fair value of options issued			385,000
Target number of shares (in shares)		15,141
Restricted Stock and Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares of the company's common stock that may be awarded						2,767,171
2011 Long-term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares of the company's common stock that may be awarded						2,893,341
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of stock options exercised		$ 1,000	$ 0	$ 1,654,000
Vesting period (in years)		5 years
Annual vesting percentage		20.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, beginning of period (in shares)		433,726.000	465,042	558,466
Exercised (in shares)		(47,484)	(29,056)	(88,050)
Forfeited (in shares)		(2,802)	(2,260)	(5,374)
Options outstanding, end of period (in shares)		411,939.000	433,726.000	465,042
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Options outstanding, weighted average exercise price (in dollars per share)		$ 8.94	$ 8.07	$ 8.12	$ 7.96
Granted, weighted average exercise price (in dollars per share)		19.64
Exercised, weighted average exercise price (in dollars per share)		6.77	8.25	6.87
Forfeited, weighted average exercise price (in dollars per share)		$ 19.58	$ 17.10	$ 12.04
Granted (in shares)		28,499
Closing price (in dollars per share)		$ 20.84
Total unrecognized expense related to non-vested stock option awards		$ 221,000
Stock based compensation, recognition period		2 years 1 month 28 days
Stock Options [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Expiration term		10 years
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Total fair value of options issued		$ 385
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercised (in shares)		0	0	(17,516)
Forfeited (in shares)		0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Granted, weighted average exercise price (in dollars per share)		$ 0.00	$ 0.00	$ 0.00
Exercised, weighted average exercise price (in dollars per share)		0.00	0.00	20.09
Forfeited, weighted average exercise price (in dollars per share)		$ 0.00	$ 0.00	$ 0.00
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Forfeited (in shares)		0	(8,669,000)	(4,284,000)
Vested shares		0	31,658,000	19,446,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Total unrecognized expense related to non-vested stock option awards		$ 761,000
Stock based compensation, recognition period		1 year 6 months 18 days
Total fair value of options issued		$ 881,000	$ 1,113,000	$ 1,187,000
Amortization Period For The Fair Value Share Based Compsensation Award (in years)		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period		50,799
Adjusted EBITDA Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Target number of shares (in shares)		32,345
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net		$ (1,069,000)	92,000	1,592,000
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition		$ 3,402,000	$ 3,749,000	$ 3,295,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Exercised (in shares)		(43,121)	(29,056)	(88,050)
IPO [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense associated with the acceleration of the pre-IPO options	$ 6,310,000
IPO [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, vested and exercisable (in shares)	2,757,524